Revert accidentally comitted sanity check

[Jan Hubicka]

Hi,
I have accidentally comitted in the following sanity check that fails
and is discussed in
https://gcc.gnu.org/pipermail/gcc-patches/2020-November/558538.html
The current ipa-icf code is conservatively correct because 
alias_ptr_types_compatible_p returns false on ref_all_alias_ptr_type_p.

Comitted as obvious.

I apologize for the breakage,
Honza

        * tree-ssa-alias.c (ao_ref_base_alias_ptr_type,
        ao_ref_alias_ptr_type): Revert accidental commit

diff --git a/gcc/tree-ssa-alias.c b/gcc/tree-ssa-alias.c
index 9f279c805e5..5ebbb087285 100644
--- a/gcc/tree-ssa-alias.c
+++ b/gcc/tree-ssa-alias.c
@@ -755,7 +755,6 @@ ao_ref_base_alias_ptr_type (ao_ref *ref)
   while (handled_component_p (base_ref))
     base_ref = TREE_OPERAND (base_ref, 0);
   tree ret = reference_alias_ptr_type (base_ref);
-  gcc_checking_assert (get_deref_alias_set (ret) == ao_ref_base_alias_set 
(ref));
   return ret;
 }
 
@@ -768,7 +767,6 @@ ao_ref_alias_ptr_type (ao_ref *ref)
   if (!ref->ref)
     return NULL_TREE;
   tree ret = reference_alias_ptr_type (ref->ref);
-  gcc_checking_assert (get_deref_alias_set (ret) == ao_ref_alias_set (ref));
   return ret;
 }